Inserted-blade cutter



June 24, 1930.

F. P. MILLER INSERTED BLADE CUTTER Filed May 1e'. '1925 INVENTORATroRNEYs Patented June 24, 1930 y l I UNITED STATES PATENT OFFICE FRANKP. MILLER, OF MEADVILLE, PENNSYLVANIA INSERTED-BLADE CUTTER Applicationfiled May 16, 1925. Serial No. 30,786.

The invention forming the subject of this an internal adjusting andthrust collar 12, application aims to provide a rotary cutter theAperiphery of which is provided with of the inserted blade type in whichthe locacoarse square or acme threads 14 which ention and arrangement ofthe adjusting and gage transverse ribs 16 on the inner edges thrustcollar provides for the expeditious of the blades.

and simultaneous adjustment of the blades, As the collar 111 flatlycontacts with the and overcomes the need of reducing the diinner Wall ofthe groove 10, turning of the ameter and consequently the strength ofcollar in the proper direction will result in the intermediate portionof the carrier or the forward movement of the blades to 1o reamer bodyfor the accommodation of the bring about an increase in the cutting di-60 adjusting and thrust collar as is now neces ameter of the tool.Figures 1, 3 and et plainsary with the reamers and other cutters on lyillustrate that the collar 14 is provided in the market. the front sidethereof with oppositely lo- Other objects and advantages will be apcatednotches 18 for the reception of a suitparent during the course of thefollowing able tool by means of which the collar may G5 description. beturned. Or, if desired, lugs or other n the accompanying drawing forminga tool engaging meansl may be provided on 1 part of this application andin which like the collar for use in adjustment. numerals are employed todesignate like It might be said that the invention form- 20 partsthroughout the same. ing the subject of this application includes 70Figure 1 is a fragmentary perspective of the thrust collar 12 mounted ona lcentral an inserted blade reamer embodying the inspindle or extension22 on one end of the vention; reamer body and provided with a threadedFigure 2 is a detail sectional View through connection with the inneredges of the blades 25 the forward portion of a reamer, the View so thatthe turning of the collar on the spin- 7 illustrating the improvedadjusting means dle will result in expansion of the reamer or for theblades; the like.

Figure 3 is a front end elevation of the Particular attention isdirectedto the fact reamer, parts being broken away; that thearrangement of the thrust collar Figure 4 is a group view illustratingthe at the forward end of the body and in en` S0 internal adjustingcollar and one of the gagement with the blades overcomes the blades.need of reducing the diameter of the body In the drawing wherein for thepurpose 5 adjacent the rear ends of the blades for of illustration isshown a preferred embodithe accommodation of the collar. There- 5 mentof the invention, the numeral 5 desig fore, the reamer body retains itsfull di-" S5 nates a carrier for a plurality of blades 6. ameter andstrength and in these respects Figures 1 and 2 illustrate that theblades 6, compares favorably with the solid or one which may be of anydesired number, are piece reamer. received in gradually deepeninggrooves 7 Having thus described the invention,

4o and are securely held in an adjusted position what is claimed as newis 90 by locking pins 8, the locking pins in turn A rotary cuttercomprising an elongated being held in place by set screws 9. Howbodyhaving grooves, blades in said grooves ever, any suitable means may beemployed and having ltheir inner edges formed with to secure the bladesin place without in any transverse ribs, the forward portion of said waydeparting from the spirit of this inbody being provided with an annularvention. groove, an adjusting and thrust member in Figures 1, 2 and 3illustrate that the forthe annular groove at the forward portion wardend of the carrier or reamer body 5 of the body and having contact withthe is provided with an annular groove 10 for inner Wall of the grooveto hold the adjust- 0 the reception of what might be said to be ing andthrust member against endwise'100 movement in one direction with respectto the body, said adjusting and thrust member being confined to theforward end of the body and provided with peripheral threads engagedwith the transverse ribs on the inner edges of said blades, whereby theturning of said member in one direction will advaneesaid blades. n

In testimony whereof I ax my signa- 10 ture. FRANK P. MILLER.

